Exposure Six Pack Sync MK2; Simpler and improved connectivity for 2021 means you can make the most of the Six Pack's deep reaching and wide beam; personalise the output from a potential ultra powerful 5000 lumens for the gnarliest of downhill sections to 36 hours and longer with ample light to complete as many laps as your body can muster during long endurance events.4750 lumens Reflex Boost, 3600 constantBurn time: Min 2 hrs Max 36 hrsSYNC Bluetooth Connected Reflex Plus Technology OLED Status Display Optimum Mode Selector Intelligent Thermal Management Fuel Gauge